article Open Access

Effect of cap thickness on corneal biomechanical stability following smile for myopia

International Journal of Ophthalmology Research · 2026 · Vol. 8(1) · pp. 06–08

Mohamed Sh Ghazy✉Hisham Adel HasbyAdel A SelimaAhmed M Ghoneim

Abstract

Background: SMILE is a minimally invasive flapless refractive surgery with superior preservation of stromal collagen architecture. Although cap thickness is standardized between 110-120 µm, its biomechanical impact remains incompletely reported. Aim: To evaluate the effect of SMILE cap thickness variation (100 µm vs 120 µm) on corneal biomechanical stability parameters. Methods: Prospective comparative clinical study including 60 myopic eyes (30 per group). All eyes underwent SMILE using VisuMax femtosecond laser (500 kHz). Corneal biomechanics were assessed preoperatively and 6 months postoperatively using CorVis ST parameters: deformation amplitude (DA) ratio, stiffness parameter at first applanation (SP-A1), and CorVis Biomechanical Index (CBI). Inter-group and intra-group changes were statistically analysed (p

Corneal surgery and disorders Ophthalmology and Visual Impairment Studies Intraocular Surgery and LensesBiomechanicsCorneaRefractive surgeryIntraocular pressureStiffnessCorneal topography

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FWCI

0.00

field-weighted impact

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17%

vs. same field & year

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